Add R600 backend
A new backend supporting AMD GPUs: Radeon HD2XXX - HD7XXX
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169915 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/R600/AMDGPUISelLowering.cpp b/lib/Target/R600/AMDGPUISelLowering.cpp
new file mode 100644
index 0000000..473dac4
--- /dev/null
+++ b/lib/Target/R600/AMDGPUISelLowering.cpp
@@ -0,0 +1,417 @@
+//===-- AMDGPUISelLowering.cpp - AMDGPU Common DAG lowering functions -----===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+/// \file
+/// \brief This is the parent TargetLowering class for hardware code gen
+/// targets.
+//
+//===----------------------------------------------------------------------===//
+
+#include "AMDGPUISelLowering.h"
+#include "AMDILIntrinsicInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/SelectionDAG.h"
+#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
+
+using namespace llvm;
+
+AMDGPUTargetLowering::AMDGPUTargetLowering(TargetMachine &TM) :
+ TargetLowering(TM, new TargetLoweringObjectFileELF()) {
+
+ // Initialize target lowering borrowed from AMDIL
+ InitAMDILLowering();
+
+ // We need to custom lower some of the intrinsics
+ setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
+
+ // Library functions. These default to Expand, but we have instructions
+ // for them.
+ setOperationAction(ISD::FCEIL, MVT::f32, Legal);
+ setOperationAction(ISD::FEXP2, MVT::f32, Legal);
+ setOperationAction(ISD::FPOW, MVT::f32, Legal);
+ setOperationAction(ISD::FLOG2, MVT::f32, Legal);
+ setOperationAction(ISD::FABS, MVT::f32, Legal);
+ setOperationAction(ISD::FFLOOR, MVT::f32, Legal);
+ setOperationAction(ISD::FRINT, MVT::f32, Legal);
+
+ // Lower floating point store/load to integer store/load to reduce the number
+ // of patterns in tablegen.
+ setOperationAction(ISD::STORE, MVT::f32, Promote);
+ AddPromotedToType(ISD::STORE, MVT::f32, MVT::i32);
+
+ setOperationAction(ISD::STORE, MVT::v4f32, Promote);
+ AddPromotedToType(ISD::STORE, MVT::v4f32, MVT::v4i32);
+
+ setOperationAction(ISD::LOAD, MVT::f32, Promote);
+ AddPromotedToType(ISD::LOAD, MVT::f32, MVT::i32);
+
+ setOperationAction(ISD::LOAD, MVT::v4f32, Promote);
+ AddPromotedToType(ISD::LOAD, MVT::v4f32, MVT::v4i32);
+
+ setOperationAction(ISD::UDIV, MVT::i32, Expand);
+ setOperationAction(ISD::UDIVREM, MVT::i32, Custom);
+ setOperationAction(ISD::UREM, MVT::i32, Expand);
+}
+
+//===---------------------------------------------------------------------===//
+// TargetLowering Callbacks
+//===---------------------------------------------------------------------===//
+
+SDValue AMDGPUTargetLowering::LowerFormalArguments(
+ SDValue Chain,
+ CallingConv::ID CallConv,
+ bool isVarArg,
+ const SmallVectorImpl<ISD::InputArg> &Ins,
+ DebugLoc DL, SelectionDAG &DAG,
+ SmallVectorImpl<SDValue> &InVals) const {
+ for (unsigned i = 0, e = Ins.size(); i < e; ++i) {
+ InVals.push_back(SDValue());
+ }
+ return Chain;
+}
+
+SDValue AMDGPUTargetLowering::LowerReturn(
+ SDValue Chain,
+ CallingConv::ID CallConv,
+ bool isVarArg,
+ const SmallVectorImpl<ISD::OutputArg> &Outs,
+ const SmallVectorImpl<SDValue> &OutVals,
+ DebugLoc DL, SelectionDAG &DAG) const {
+ return DAG.getNode(AMDGPUISD::RET_FLAG, DL, MVT::Other, Chain);
+}
+
+//===---------------------------------------------------------------------===//
+// Target specific lowering
+//===---------------------------------------------------------------------===//
+
+SDValue AMDGPUTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG)
+ const {
+ switch (Op.getOpcode()) {
+ default:
+ Op.getNode()->dump();
+ assert(0 && "Custom lowering code for this"
+ "instruction is not implemented yet!");
+ break;
+ // AMDIL DAG lowering
+ case ISD::SDIV: return LowerSDIV(Op, DAG);
+ case ISD::SREM: return LowerSREM(Op, DAG);
+ case ISD::SIGN_EXTEND_INREG: return LowerSIGN_EXTEND_INREG(Op, DAG);
+ case ISD::BRCOND: return LowerBRCOND(Op, DAG);
+ // AMDGPU DAG lowering
+ case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
+ case ISD::UDIVREM: return LowerUDIVREM(Op, DAG);
+ }
+ return Op;
+}
+
+SDValue AMDGPUTargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op,
+ SelectionDAG &DAG) const {
+ unsigned IntrinsicID = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
+ DebugLoc DL = Op.getDebugLoc();
+ EVT VT = Op.getValueType();
+
+ switch (IntrinsicID) {
+ default: return Op;
+ case AMDGPUIntrinsic::AMDIL_abs:
+ return LowerIntrinsicIABS(Op, DAG);
+ case AMDGPUIntrinsic::AMDIL_exp:
+ return DAG.getNode(ISD::FEXP2, DL, VT, Op.getOperand(1));
+ case AMDGPUIntrinsic::AMDGPU_lrp:
+ return LowerIntrinsicLRP(Op, DAG);
+ case AMDGPUIntrinsic::AMDIL_fraction:
+ return DAG.getNode(AMDGPUISD::FRACT, DL, VT, Op.getOperand(1));
+ case AMDGPUIntrinsic::AMDIL_mad:
+ return DAG.getNode(AMDGPUISD::MAD, DL, VT, Op.getOperand(1),
+ Op.getOperand(2), Op.getOperand(3));
+ case AMDGPUIntrinsic::AMDIL_max:
+ return DAG.getNode(AMDGPUISD::FMAX, DL, VT, Op.getOperand(1),
+ Op.getOperand(2));
+ case AMDGPUIntrinsic::AMDGPU_imax:
+ return DAG.getNode(AMDGPUISD::SMAX, DL, VT, Op.getOperand(1),
+ Op.getOperand(2));
+ case AMDGPUIntrinsic::AMDGPU_umax:
+ return DAG.getNode(AMDGPUISD::UMAX, DL, VT, Op.getOperand(1),
+ Op.getOperand(2));
+ case AMDGPUIntrinsic::AMDIL_min:
+ return DAG.getNode(AMDGPUISD::FMIN, DL, VT, Op.getOperand(1),
+ Op.getOperand(2));
+ case AMDGPUIntrinsic::AMDGPU_imin:
+ return DAG.getNode(AMDGPUISD::SMIN, DL, VT, Op.getOperand(1),
+ Op.getOperand(2));
+ case AMDGPUIntrinsic::AMDGPU_umin:
+ return DAG.getNode(AMDGPUISD::UMIN, DL, VT, Op.getOperand(1),
+ Op.getOperand(2));
+ case AMDGPUIntrinsic::AMDIL_round_nearest:
+ return DAG.getNode(ISD::FRINT, DL, VT, Op.getOperand(1));
+ }
+}
+
+///IABS(a) = SMAX(sub(0, a), a)
+SDValue AMDGPUTargetLowering::LowerIntrinsicIABS(SDValue Op,
+ SelectionDAG &DAG) const {
+
+ DebugLoc DL = Op.getDebugLoc();
+ EVT VT = Op.getValueType();
+ SDValue Neg = DAG.getNode(ISD::SUB, DL, VT, DAG.getConstant(0, VT),
+ Op.getOperand(1));
+
+ return DAG.getNode(AMDGPUISD::SMAX, DL, VT, Neg, Op.getOperand(1));
+}
+
+/// Linear Interpolation
+/// LRP(a, b, c) = muladd(a, b, (1 - a) * c)
+SDValue AMDGPUTargetLowering::LowerIntrinsicLRP(SDValue Op,
+ SelectionDAG &DAG) const {
+ DebugLoc DL = Op.getDebugLoc();
+ EVT VT = Op.getValueType();
+ SDValue OneSubA = DAG.getNode(ISD::FSUB, DL, VT,
+ DAG.getConstantFP(1.0f, MVT::f32),
+ Op.getOperand(1));
+ SDValue OneSubAC = DAG.getNode(ISD::FMUL, DL, VT, OneSubA,
+ Op.getOperand(3));
+ return DAG.getNode(AMDGPUISD::MAD, DL, VT, Op.getOperand(1),
+ Op.getOperand(2),
+ OneSubAC);
+}
+
+/// \brief Generate Min/Max node
+SDValue AMDGPUTargetLowering::LowerMinMax(SDValue Op,
+ SelectionDAG &DAG) const {
+ DebugLoc DL = Op.getDebugLoc();
+ EVT VT = Op.getValueType();
+
+ SDValue LHS = Op.getOperand(0);
+ SDValue RHS = Op.getOperand(1);
+ SDValue True = Op.getOperand(2);
+ SDValue False = Op.getOperand(3);
+ SDValue CC = Op.getOperand(4);
+
+ if (VT != MVT::f32 ||
+ !((LHS == True && RHS == False) || (LHS == False && RHS == True))) {
+ return SDValue();
+ }
+
+ ISD::CondCode CCOpcode = cast<CondCodeSDNode>(CC)->get();
+ switch (CCOpcode) {
+ case ISD::SETOEQ:
+ case ISD::SETONE:
+ case ISD::SETUNE:
+ case ISD::SETNE:
+ case ISD::SETUEQ:
+ case ISD::SETEQ:
+ case ISD::SETFALSE:
+ case ISD::SETFALSE2:
+ case ISD::SETTRUE:
+ case ISD::SETTRUE2:
+ case ISD::SETUO:
+ case ISD::SETO:
+ assert(0 && "Operation should already be optimised !");
+ case ISD::SETULE:
+ case ISD::SETULT:
+ case ISD::SETOLE:
+ case ISD::SETOLT:
+ case ISD::SETLE:
+ case ISD::SETLT: {
+ if (LHS == True)
+ return DAG.getNode(AMDGPUISD::FMIN, DL, VT, LHS, RHS);
+ else
+ return DAG.getNode(AMDGPUISD::FMAX, DL, VT, LHS, RHS);
+ }
+ case ISD::SETGT:
+ case ISD::SETGE:
+ case ISD::SETUGE:
+ case ISD::SETOGE:
+ case ISD::SETUGT:
+ case ISD::SETOGT: {
+ if (LHS == True)
+ return DAG.getNode(AMDGPUISD::FMAX, DL, VT, LHS, RHS);
+ else
+ return DAG.getNode(AMDGPUISD::FMIN, DL, VT, LHS, RHS);
+ }
+ case ISD::SETCC_INVALID:
+ assert(0 && "Invalid setcc condcode !");
+ }
+ return Op;
+}
+
+
+
+SDValue AMDGPUTargetLowering::LowerUDIVREM(SDValue Op,
+ SelectionDAG &DAG) const {
+ DebugLoc DL = Op.getDebugLoc();
+ EVT VT = Op.getValueType();
+
+ SDValue Num = Op.getOperand(0);
+ SDValue Den = Op.getOperand(1);
+
+ SmallVector<SDValue, 8> Results;
+
+ // RCP = URECIP(Den) = 2^32 / Den + e
+ // e is rounding error.
+ SDValue RCP = DAG.getNode(AMDGPUISD::URECIP, DL, VT, Den);
+
+ // RCP_LO = umulo(RCP, Den) */
+ SDValue RCP_LO = DAG.getNode(ISD::UMULO, DL, VT, RCP, Den);
+
+ // RCP_HI = mulhu (RCP, Den) */
+ SDValue RCP_HI = DAG.getNode(ISD::MULHU, DL, VT, RCP, Den);
+
+ // NEG_RCP_LO = -RCP_LO
+ SDValue NEG_RCP_LO = DAG.getNode(ISD::SUB, DL, VT, DAG.getConstant(0, VT),
+ RCP_LO);
+
+ // ABS_RCP_LO = (RCP_HI == 0 ? NEG_RCP_LO : RCP_LO)
+ SDValue ABS_RCP_LO = DAG.getSelectCC(DL, RCP_HI, DAG.getConstant(0, VT),
+ NEG_RCP_LO, RCP_LO,
+ ISD::SETEQ);
+ // Calculate the rounding error from the URECIP instruction
+ // E = mulhu(ABS_RCP_LO, RCP)
+ SDValue E = DAG.getNode(ISD::MULHU, DL, VT, ABS_RCP_LO, RCP);
+
+ // RCP_A_E = RCP + E
+ SDValue RCP_A_E = DAG.getNode(ISD::ADD, DL, VT, RCP, E);
+
+ // RCP_S_E = RCP - E
+ SDValue RCP_S_E = DAG.getNode(ISD::SUB, DL, VT, RCP, E);
+
+ // Tmp0 = (RCP_HI == 0 ? RCP_A_E : RCP_SUB_E)
+ SDValue Tmp0 = DAG.getSelectCC(DL, RCP_HI, DAG.getConstant(0, VT),
+ RCP_A_E, RCP_S_E,
+ ISD::SETEQ);
+ // Quotient = mulhu(Tmp0, Num)
+ SDValue Quotient = DAG.getNode(ISD::MULHU, DL, VT, Tmp0, Num);
+
+ // Num_S_Remainder = Quotient * Den
+ SDValue Num_S_Remainder = DAG.getNode(ISD::UMULO, DL, VT, Quotient, Den);
+
+ // Remainder = Num - Num_S_Remainder
+ SDValue Remainder = DAG.getNode(ISD::SUB, DL, VT, Num, Num_S_Remainder);
+
+ // Remainder_GE_Den = (Remainder >= Den ? -1 : 0)
+ SDValue Remainder_GE_Den = DAG.getSelectCC(DL, Remainder, Den,
+ DAG.getConstant(-1, VT),
+ DAG.getConstant(0, VT),
+ ISD::SETGE);
+ // Remainder_GE_Zero = (Remainder >= 0 ? -1 : 0)
+ SDValue Remainder_GE_Zero = DAG.getSelectCC(DL, Remainder,
+ DAG.getConstant(0, VT),
+ DAG.getConstant(-1, VT),
+ DAG.getConstant(0, VT),
+ ISD::SETGE);
+ // Tmp1 = Remainder_GE_Den & Remainder_GE_Zero
+ SDValue Tmp1 = DAG.getNode(ISD::AND, DL, VT, Remainder_GE_Den,
+ Remainder_GE_Zero);
+
+ // Calculate Division result:
+
+ // Quotient_A_One = Quotient + 1
+ SDValue Quotient_A_One = DAG.getNode(ISD::ADD, DL, VT, Quotient,
+ DAG.getConstant(1, VT));
+
+ // Quotient_S_One = Quotient - 1
+ SDValue Quotient_S_One = DAG.getNode(ISD::SUB, DL, VT, Quotient,
+ DAG.getConstant(1, VT));
+
+ // Div = (Tmp1 == 0 ? Quotient : Quotient_A_One)
+ SDValue Div = DAG.getSelectCC(DL, Tmp1, DAG.getConstant(0, VT),
+ Quotient, Quotient_A_One, ISD::SETEQ);
+
+ // Div = (Remainder_GE_Zero == 0 ? Quotient_S_One : Div)
+ Div = DAG.getSelectCC(DL, Remainder_GE_Zero, DAG.getConstant(0, VT),
+ Quotient_S_One, Div, ISD::SETEQ);
+
+ // Calculate Rem result:
+
+ // Remainder_S_Den = Remainder - Den
+ SDValue Remainder_S_Den = DAG.getNode(ISD::SUB, DL, VT, Remainder, Den);
+
+ // Remainder_A_Den = Remainder + Den
+ SDValue Remainder_A_Den = DAG.getNode(ISD::ADD, DL, VT, Remainder, Den);
+
+ // Rem = (Tmp1 == 0 ? Remainder : Remainder_S_Den)
+ SDValue Rem = DAG.getSelectCC(DL, Tmp1, DAG.getConstant(0, VT),
+ Remainder, Remainder_S_Den, ISD::SETEQ);
+
+ // Rem = (Remainder_GE_Zero == 0 ? Remainder_A_Den : Rem)
+ Rem = DAG.getSelectCC(DL, Remainder_GE_Zero, DAG.getConstant(0, VT),
+ Remainder_A_Den, Rem, ISD::SETEQ);
+ SDValue Ops[2];
+ Ops[0] = Div;
+ Ops[1] = Rem;
+ return DAG.getMergeValues(Ops, 2, DL);
+}
+
+//===----------------------------------------------------------------------===//
+// Helper functions
+//===----------------------------------------------------------------------===//
+
+bool AMDGPUTargetLowering::isHWTrueValue(SDValue Op) const {
+ if (ConstantFPSDNode * CFP = dyn_cast<ConstantFPSDNode>(Op)) {
+ return CFP->isExactlyValue(1.0);
+ }
+ if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
+ return C->isAllOnesValue();
+ }
+ return false;
+}
+
+bool AMDGPUTargetLowering::isHWFalseValue(SDValue Op) const {
+ if (ConstantFPSDNode * CFP = dyn_cast<ConstantFPSDNode>(Op)) {
+ return CFP->getValueAPF().isZero();
+ }
+ if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
+ return C->isNullValue();
+ }
+ return false;
+}
+
+SDValue AMDGPUTargetLowering::CreateLiveInRegister(SelectionDAG &DAG,
+ const TargetRegisterClass *RC,
+ unsigned Reg, EVT VT) const {
+ MachineFunction &MF = DAG.getMachineFunction();
+ MachineRegisterInfo &MRI = MF.getRegInfo();
+ unsigned VirtualRegister;
+ if (!MRI.isLiveIn(Reg)) {
+ VirtualRegister = MRI.createVirtualRegister(RC);
+ MRI.addLiveIn(Reg, VirtualRegister);
+ } else {
+ VirtualRegister = MRI.getLiveInVirtReg(Reg);
+ }
+ return DAG.getRegister(VirtualRegister, VT);
+}
+
+#define NODE_NAME_CASE(node) case AMDGPUISD::node: return #node;
+
+const char* AMDGPUTargetLowering::getTargetNodeName(unsigned Opcode) const {
+ switch (Opcode) {
+ default: return 0;
+ // AMDIL DAG nodes
+ NODE_NAME_CASE(MAD);
+ NODE_NAME_CASE(CALL);
+ NODE_NAME_CASE(UMUL);
+ NODE_NAME_CASE(DIV_INF);
+ NODE_NAME_CASE(RET_FLAG);
+ NODE_NAME_CASE(BRANCH_COND);
+
+ // AMDGPU DAG nodes
+ NODE_NAME_CASE(DWORDADDR)
+ NODE_NAME_CASE(FRACT)
+ NODE_NAME_CASE(FMAX)
+ NODE_NAME_CASE(SMAX)
+ NODE_NAME_CASE(UMAX)
+ NODE_NAME_CASE(FMIN)
+ NODE_NAME_CASE(SMIN)
+ NODE_NAME_CASE(UMIN)
+ NODE_NAME_CASE(URECIP)
+ NODE_NAME_CASE(INTERP)
+ NODE_NAME_CASE(INTERP_P0)
+ NODE_NAME_CASE(EXPORT)
+ }
+}